Sri Lanka opener Kusal Mendis compiled a stroke-filled 54 to set up a commanding 33-run victory for the former champions in a warm-up match for the T20 World Cup against Zimbabwe in Melbourne on Tuesday.
In the day's other warmup at the same venue, Ireland suffered a spectacular collapse against Namibia to go down by 11 runs in a low-scoring match.
Dasun Shanaka's Lankan side arrived for the current edition in Australia buoyed by their Asia Cup triumph where they lifted the title ahead of powerhouses India and Pakistan, rekindling hopes of repeating their 2014 success in the T20 World Cup.
Their indifferent form in bilateral T20 series earlier in the year have meant Sri Lanka have to play in the qualifying stage where eight teams have been split into two groups with the top two from each progressing to the Super 12 stage.